Date: Mon, 8 Jul 2002 13:09:01 -0700 From: faSty <fasty@i-sphere.com> To: twig les <twigles@yahoo.com> Cc: freebsd-security@freebsd.org Subject: Re: hiding OS name Message-ID: <20020708200901.GB94197@i-sphere.com> In-Reply-To: <20020708195244.79411.qmail@web10107.mail.yahoo.com> References: <20020708183726.GA363@straylight.oblivion.bg> <20020708195244.79411.qmail@web10107.mail.yahoo.com>
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Yeah, I know. but it still Denial of Service with spoofing hit hard on portsentry. -fasty On Mon, Jul 08, 2002 at 12:52:44PM -0700, twig les wrote: > Nah, they have an ignore file of IPs to never block. > rude but simple and effective. > > > --- Peter Pentchev <roam@ringlet.net> wrote: > > On Mon, Jul 08, 2002 at 02:13:42PM -0400, Klaus > > Steden wrote: > > > > Portsentry may help > > (/usr/ports/security/portsentry I > > > > believe). Won't hide the OS, but it may shut > > down > > > > scans before they get that far. <shrug>, never > > tested > > > > it that way. > > > > > > > A friend of mine runs portsentry configured to > > blackhole every IP that > > > attempts to connect to a port where no server is > > running (in conjunction with > > > a strict firewall); that can be done in FreeBSD > > without using portsentry, via > > > the blackhole sysctl MIBs. See blackhole(4). > > > > > > It's not a bad means to keep people out of your > > machines. > > > > I know I'm going to regret posting in this thread, > > but so be it :) > > > > Does your friend know that, unlikely as it is made > > by modern ingress and > > egress routing practices, IP spoofing is still not > > quite ruled out? > > Will your friend's portsentry setup happily > > blackhole e.g. his ISP's > > nameserver, or the root nameservers, or > > www.cnn.com's IP addresses, > > simply because somebody found a way to send a TCP > > SYN packet with a > > forged source address to e.g. your friend's > > machine's port 3? :) > > > > G'luck, > > Peter > > > > -- > > Peter Pentchev roam@ringlet.net roam@FreeBSD.org > > PGP key: > > http://people.FreeBSD.org/~roam/roam.key.asc > > Key fingerprint FDBA FD79 C26F 3C51 C95E DF9E ED18 > > B68D 1619 4553 > > Do you think anybody has ever had *precisely this > > thought* before? > > > > > ATTACHMENT part 2 application/pgp-signature > > > > ===== > ----------------------------------------------------------- > All warfare is based on deception. > ----------------------------------------------------------- > > __________________________________________________ > Do You Yahoo!? > Sign up for SBC Yahoo! Dial - First Month Free > http://sbc.yahoo.com > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-security" in the body of the message -- Chicago law prohibits eating in a place that is on fire. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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